Browsing by Publisher "Institute of Materials and Machine Mechanics, Slovak Academy of Sciences"
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Item Investigation of mechanical and metallurgical properties of titanium alloys by using laser and GTA welding(Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, 2013) Kilerci I.; Köksal N.S.Titanium alloys are widely used in many fields such as the automotive, aerospace and chemical industries. In some applications, titanium alloys are needed for use with particular welding methods. These are GTAW, GMAW and laser welding. In this study, Titanium Grade-2 (Cp-Ti) plates were welded using laser welding and GTAW. Tensile and flexural tests were applied to the welded samples. The microstructure and SEM images of main material and welded regions were studied and microhardness measurements were performed. Tensile and flexural strengths of laser welded samples were higher than those of GTA welded samples. The microhardness values of the weld-zone of laser welded samples were lower than those of the GTA welded samples welding zone. In microstructure and SEM investigations, the oxide structures and splashes of molten metal appearing like drops were identified. The width of the weld-zone in laser welding was in a narrow range. © 2013 Institute of Materials and Machine Mechanics, Slovak Academy of Sciences. All rights reserved.Item Performance of Fe-based hardfacings on hot forging die: Experimental, numerical and industrial studies(Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, 2018) Saklakoglu N.; Irizalp S.G.; Dogan S.; Ildas G.; Saklakoglu I.E.This paper is an investigation into the use of Fe-based alloys as part of wear resistant hardfacing materials in AISI 1.2714 tool steel. Four different weld hardfacing alloys were deposited on 1.2714 steel substrates using tungsten inert gas welding (TIG) process. Wear tests were carried out using a pin-on-disc wear tester at room temperature. Microhardness and micrographs of the weld overlays were obtained. High-Temperature properties were estimated by numerical analysis. The phases of the hardfacings were obtained by XRD and also estimated by numerical analysis. The results from the laboratory tests were then compared with the results obtained from field studies. The results showed that some Fe-based alloys improved dies lifetime; others created poor surfaces. A Fe-based hardfacing alloy D which included high C with Cr, W, Mo had the best wear behavior among the weld overlays. © 2018 Institute of Materials and Machine Mechanics, Slovak Academy of Sciences. All rights reserved.Item In-situ compaction and sintering of Al2O3-B4C composites by using a High-Frequency Induction System(Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, 2018) Çavdar U.; Altintaş A.; Karaca B.Alumina powders containing varying ratios of B4C were mixed in a V-type mixer for 30 min with 35 cycle/min to obtain a homogeneous mixture. Six different chemical compositions were prepared and sintered at 1600◦C for 20 min using an Ultra-High-Frequency Induction Heated System. The samples were cooled by air. The density, surface roughness, hardness and microstructure of samples were investigated. The results showed that when the amount of B4C increased, the values of hardness increased and the values of surface roughness decreased. © 2018 Institute of Materials and Machine Mechanics, Slovak Academy of Sciences. All rights reserved.Item Performance of Fe-based hardfacings on hot forging die: Experimental, numerical and industrial studies(Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, 2018) Saklakoglu N.; Irizalp S.G.; Dogan S.; Ildas G.; Saklakoglu I.E.This paper is an investigation into the use of Fe-based alloys as part of wear resistant hardfacing materials in AISI 1.2714 tool steel. Four different weld hardfacing alloys were deposited on 1.2714 steel substrates using tungsten inert gas welding (TIG) process. Wear tests were carried out using a pin-on-disc wear tester at room temperature. Microhardness and micrographs of the weld overlays were obtained. High-temperature properties were estimated by numerical analysis. The phases of the hardfacings were obtained by XRD and also estimated by numerical analysis. The results from the laboratory tests were then compared with the results obtained from field studies. The results showed that some Fe-based alloys improved dies lifetime; others created poor surfaces. A Fe-based hardfacing alloy D which included high C with Cr, W, Mo had the best wear behavior among the weld overlays. © 2018 Institute of Materials and Machine Mechanics, Slovak Academy of Sciences. All rights reserved.Item In-situ compaction and sintering of Al2O3-B4C composites by using a High-Frequency Induction System(Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, 2018) Çavdar U.; Altintaş A.; Karaca B.Alumina powders containing varying ratios of B4C were mixed in a V-type mixer for 30 min with 35 cycle/min to obtain a homogeneous mixture. Six different chemical compositions were prepared and sintered at 1600°C for 20 min using an Ultra-High-Frequency Induction Heated System. The samples were cooled by air. The density, surface roughness, hardness and microstructure of samples were investigated. The results showed that when the amount of B4C increased, the values of hardness increased and the values of surface roughness decreased. © 2018 Institute of Materials and Machine Mechanics, Slovak Academy of Sciences. All rights reserved.Item Experimental evaluation and FE simulation of phase transformations and tensile stresses in hot forging and controlled cooling(Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, 2022) Hocalar C.; Saklakoglu N.; Demirok S.This paper encompasses the development of a microstructure-based numerical model (FEM) of the conveyor cooling process after the hot forging of industrial steel with accurate predictions of the volume fraction of phases as yield and tensile strengths. An experimental procedure for validating the FEM was conducted using optical and scanning electron microscopy and tensile tests. Results showed very good agreement between the phase predictions of the 3D FEM model and those obtained from direct measurement of forged parts, with an average error of about 3.6 and 6.9 % for ferrite and pearlite phases, respectively. Tensile test results were evaluated at a 90 % reliability level, and very good agreements were obtained with an error of about 3 and 5 % for the yield and tensile strengths. The methodology could predict the phase transformations, and the mechanical properties during cooling after the hot forging of the steel were investigated. © 2022 Institute of Materials and Machine Mechanics, Slovak Academy of Sciences. All rights reserved.Item Investigation of the effect of shot blasting on the surface properties of the HA coatings processed by the EPD method(Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, 2022) Bahçepinar A.I.; Aydin I.316L stainless steel implant material surfaces shot blasted with glass beads underwent hydroxyapatite (HA) coating process by electrophoretic deposition method (EPD). The mechanical and metallographic test results of HA coatings applied to the shot blasted and sanded substrates have been discussed. The sanded process was carried out with 320 Grit SiC sandpaper. Shot blasted process was carried out in a vacuum shot blasting machine at 5 bar pressure with glass beads. Ethanol was used as a solvent during the coating process. The coating solution was prepared by mixing ethanol, HA, PVA, and N, N-Dimethylformamide chemicals in specific ratios to have a steady suspension. Regarding tests conducted on HA coatings, it was revealed that shot blasted surfaces had better results when compared to those of sanded surfaces. Hopefully, this new process for coatings will be a new impression for future studies. © 2022 Institute of Materials and Machine Mechanics, Slovak Academy of Sciences. All rights reserved.